//
//  NewFeatureViewController.swift
//  Sina
//
//  Created by 王杰 on 15/11/17.
//  Copyright © 2015年 王杰. All rights reserved.
//

import UIKit

private let reuseIdentifier = "Cell"
private let imageCount = 4

class NewFeatureViewController: UICollectionViewController {
    
    //实例化layout
    
    init() {
    
        let layout = UICollectionViewFlowLayout()
        
        layout.minimumInteritemSpacing = 0
        layout.minimumLineSpacing = 0
        layout.scrollDirection = .Horizontal
        layout.itemSize = UIScreen.mainScreen().bounds.size
        
        super.init(collectionViewLayout: layout)
        
        collectionView?.showsHorizontalScrollIndicator = false
        collectionView?.bounces = false
        collectionView?.pagingEnabled = true
        
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    override func viewDidLoad() {
        super.viewDidLoad()
        
        self.collectionView!.registerClass(NewFeatureCell.self, forCellWithReuseIdentifier: reuseIdentifier)
        
        // Do any additional setup after loading the view.
    }
    
    override func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {

        return imageCount
        
    }
    
    override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCellWithReuseIdentifier(reuseIdentifier, forIndexPath: indexPath) as! NewFeatureCell
        
        cell.index = indexPath.item
        return cell
    }
    
    override func scrollViewDidEndDecelerating(scrollView: UIScrollView) {
        let page = Int(scrollView.contentOffset.x / screenW)
        if page == imageCount - 1 {
            //开始动画效果

            if let cell = collectionView?.visibleCells().last as? NewFeatureCell {
                cell.startAnimation()
            }
        }
    }
    
}

class NewFeatureCell:UICollectionViewCell
{
    
    //设置图片
    var index: Int = 0 {
        didSet {

            iconImage.image = UIImage(named: "new_feature_\(index + 1)")
            startButton.hidden = true

        }
    }
    
    //MARK: 按钮的点击事件
    @objc private func start() {
        print("用我吧")
    NSNotificationCenter.defaultCenter().postNotificationName(AppSwitchRootViewControler, object: nil)
    }
    
    private func startAnimation() {
    
    startButton.transform = CGAffineTransformMakeScale(0, 0)
        UIView.animateWithDuration(1, delay: 0, usingSpringWithDamping: 0.5, initialSpringVelocity: 5, options: [], animations: { () -> Void in
            self.startButton.hidden = false
            self.startButton.transform = CGAffineTransformMakeScale(1, 1)
            }) { (_) -> Void in
                
                print("OK")
        }
    
    }
    //设置frame
    override  init(frame: CGRect) {
        super.init(frame: frame)
        setupUI()
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    //设置UI
    private func setupUI() {
    
    contentView.addSubview(iconImage)
    contentView.addSubview(startButton)
        iconImage.snp_makeConstraints { (make) -> Void in
            make.edges.equalTo(contentView.snp_edges)
        }
        
        startButton.snp_makeConstraints { (make) -> Void in
            make.centerX.equalTo(contentView.snp_centerX)
            make.bottom.equalTo(contentView.snp_bottom).offset(-200)
        }
        
        startButton.addTarget(self, action: "start", forControlEvents: .TouchUpInside)
        
    }
    
    //懒加载控件
    private lazy var iconImage: UIImageView = UIImageView()
    
    private lazy var startButton: UIButton =  UIButton(title: "开始体验", backImage: "new_feature_finish_button", color: nil)
    
}














